Palynology of Middle Tertiary lacustrine deposits

198 K. TAKAHASHI & U. lux
1967 Laevigatosporites haardti crassicus Krutzsch, Atlas, Lfg. IV & V, S. 149, Taf. 53,
Fig. 1 - 3 .
Diagnostic characters: Monolete spore with a bean-shaped or reniform outline in
equatorial sight. Exospore laevigate, two-layered,
1 pm thick. Dehiscence mark
moderately long, curved, with ca. 4 pm thick lips. Face of dehiscence concave.
Measurements: 41 pm in length and 28 pm in width.
Width / length ratio: 0.68.
Stratigraphic range: Late Oligocene in Germany (borehole Spremberg).
Remarks: The specimen can be separated from L. haardti haardti and L. haardti
haardtioides by its dehiscence mark with the reinforced lips.
Botanical affinity: Polypodiaceae.
Laevigatosporites oviformis n. sp.
PI. 3, figs. 5 - 6 .
Diagnosis: Monolete spore with an elliptical or wide oval contour in polar view.
Dehiscence furrow straight, relatively short, sometimes gaping, always exposing
swollen lips. Exospore smooth, two-layered, 1. 3-1. 5 pm thick; ectexine double as
thick as endexine.
Measurements: 37 - 46 ,urn in length and 33 - 35 ,urn in width.
Width / length ratio: 0.76-0.89.
Holotype: PI. 3, fig. 5; 37 pm in length and 33 pm in width; exine psilate, twolayered,
1.3 pm thick, ectexine is 0.9 pm and endexine is 0.4 ,urn thick; width /
length ratio: 0.89; no. of sample; Jos 1 -13 (GN 5333).
Name derivation: ovum = egg (lat. ) ; formis = shaped like (lat.). The epithet oviformis
describes specifically the oval form of the spore.
Remarks: This form-species is rather rarely found. It appears to be similar to
Laevigatosporites ovatus Wilson & Webster (1946) from the Paleocene Fort Union
Formation in Montana (USA) as well as Laevigatosporites ovoideus Takahashi (1961)
from the Miocene Yunoki Formation of the Sasebo coal-field in Nagasaki (Japan),
but L. oviformis always exposes its dehiscence furrow with swollen lips.
Botanical affinity: Polypodiaceae.
Infraturma Sculptatomonoleti Dybova & Jachowitz 1957.
Genus Verrucatosporites Thomson & Pflug 1953 emend. Potonie 1956.
Type species: Verrucatosporites alienus (Potonie 1931) Thomson & Pflug 1953.